Structure and Infrared Emissivity Properties of the MAO Coatings Formed on TC4 Alloys in K2ZrF6-Based Solution
| Autor: | Guangrui Gao, Zhengping Xi, Li Ying, Dan Hu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
micro-arc oxidation
K2ZrF6 coating infrared emissivity Materials science Scanning electron microscope Infrared Metaphosphate Analytical chemistry 02 engineering and technology 01 natural sciences lcsh:Technology Article chemistry.chemical_compound X-ray photoelectron spectroscopy 0103 physical sciences Emissivity General Materials Science Ceramic lcsh:Microscopy lcsh:QC120-168.85 010302 applied physics lcsh:QH201-278.5 lcsh:T 021001 nanoscience & nanotechnology Microstructure Amorphous solid chemistry lcsh:TA1-2040 visual_art visual_art.visual_art_medium lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials, Vol 11, Iss 2, p 254 (2018) Materials Materials; Volume 11; Issue 2; Pages: 254 |
| ISSN: | 1996-1944 |
| Popis: | Micro-arc oxidation (MAO) ceramic coatings were formed on TC4 alloy surface in silicate and metaphosphate electrolytes based with K2ZrF6 for various concentrations. X-ray diffraction (XRD), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) were used to characterize the phase composition, microstructure and chemical compositions of the coatings. The infrared emissivity of the coatings was measured at 50 °C in a wavelength range of 8–20 µm. The microstructural observations all revealed the typical porousstructures. Moreover, adecline in roughness and thickness of the prepared coatings can be observed when the concentration of K2ZrF6 increases. Combined with the results of XRD and XPS, it was found that all the oxides existed as the amorphous form in the coatings except the TiO2 phase. The coatings exhibited the highest infrared emissivity value (about 0.89) when the concentration of K2ZrF6 was 6 g/L, which was possibly attributed to the defect microstructure and the optimal role of ZrO2. |
| Databáze: | OpenAIRE |
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